Music Theory Online is an academic journal dedicated to the field of music theory, which provides a rich resource and communication platform for music scholars, educators, students, and enthusiasts. The journal includes multiple types of content to promote in-depth research and broad discussion of music theory. Published articles usually cover all aspects of music theory, including theoretical analysis, historical music theory, music formal, music cognition, etc. These articles are peer-reviewed, ensuring the rigor and innovation of academic research.

The Reviews section provides readers with a critical evaluation of newly published music theory books and journals. Through these reviews, the journal not only provides the academic community with in-depth insights into new publications, but also facilitates scholarly discussion and knowledge dissemination. Critical essays are further discussions or critiques of published articles that can offer different perspectives and stimulate deeper academic dialogue. This interactivity is a feature of the MTO, which encourages open and diverse voices to participate in discussions of music theory.